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Exchange 2000/DNS/no outbound mail

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by cricket_moon 2 views

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We recently changed our entire ip. Everything else seems to be reacting rather well. However, we have no outbound mail. Instead, we are getting "Could not deliver the message in the time limit specified. Please retry or contact your administrator. server.mydomain.com #4.4.7
We are able to recieve mail, just not send. :-| Please help

10 replies

by shmaltz

Do you have a firewall? If yes make sure that port 25 is allowed from the Exchange Server. Can the Exchange Server connect to the Internet? Is IP Filtering enabled on the Windows 2000 Exchange Server? If yes make sure port 25 is allowed in and out. Is the SMTP Virtual Server started? If not find out why. Is all the email bounced back? or only to certian doamins? You might be blocked by that doamin for whatever reason (a common reason is because spam has been done from your IP Address and/or domain.
Make sure the users have a default SMTP address that is reachable on the Internet. Make sure the users don't have restrictions in using the SMTP protocol (you set that in Active Directory, under protocol settings).

by cricket_moon

port 25 is fine. Checked and tried. From the exchange server, I can telnet to another mail server via port 25. This is all email that is bounced.

by shmaltz

Is the SMTP Virtual Server Started?
Is the SMTP Protocol enabled on the user leve?

by cg it

when you say you changed your entire IP, what changed? Can't answer without more information.

by cricket_moon

the subnet. We changed our internet provider, and therefore changed our subnet. Before you ask, yes there is a ptr and an MX record for our exchange server. We are able to get mail. Just not send it.

by shmaltz

Is DNS set up correctly?
Can you ping other mail servers from your Exchange Server by name?

by cricket_moon

Well. I figured out what the problem was. Thank you to everyone who was trying to help. In the SMTP Virtual Server, the DNS pointed to our old DNS server. I changed that, and messages just immediately started heading out! :-)

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